Java Convert an Object to String

25 Oct 2024 | 5 min read

We can convert Object to String in Java by using the toString() method of Object class or String.valueOf(object) method.

We can convert an object to String in Java whether it is user-defined class, StringBuilder, StringBuffer or anything else.

There are the following ways to convert object to string in Java:

Method	Description
Object.toString()	Provides a textual representation of the object, detailing its characteristics or state.
String.valueOf()	A static function of the String class that transforms an object into its string form.
+ Operator	It facilitates combining any data type with a string, creating a new string that includes the added content.
String.join()	Merges an array of elements into a single string, utilizing a specified separator between each element's string form.

Using toString() Method

The toString() method in Java enables the conversion of user-defined class objects into descriptive strings, that aids in debugging and enhances code readability.

Filename: ToStringMethod.java

Output:

Student{name='Alice', age=20}

Java Program to Convert Object of Predefined Class(StringBuilder) to String

Using Sting.valueOf() Method

The valueOf() method in Java is a String class static method. It converts different types of values, including objects and Strings. When working with objects of predefined classes such as StringBuilder, the valueOf() method can convert these objects into strings. Let's understand it with an example.

Filename: ValueOfMethod.java

Output:

String representation: TeamMember [firstName=Jainey, lastName=Jain]
TeamMember's full name: Jainey Jain

Using + Operator

In Java, the + Operator is overloaded as a concatenation operator for strings. When used with strings and other data types, including objects, the + Operator implicitly converts the non-string elements to strings. The conversion often involves calling the toString() Method of the concatenated object.

Filename: ObjToString.java

Output:

The details of the book are: Book{title='1984', author='George Orwell'}

Using String.join() Method

The join() method in Java is a static method of the String class used to concatenate the elements of an array or iterable into a single String, with a specified delimiter between each element. While the primary use of join() is for concatenating strings. It can also indirectly convert an object to a string, given that the object's toString() Method is effectively utilized.

Filename: JoinMethod.java

Output:

Person{name='Alice', age=30}, Person{name='Bob', age=25}, Person{name='Charlie', age=35}

Java Program to Convert User-defined Class Object into String

Let's see the simple code to convert String to Object in Java.

ObjectToStringExample.java

Output:

Emp@2a139a55
Emp@2a139a55

In the above Java program, we observe that a reference id of Emp class is printed on the console.

Java Program to Convert Pre-Defined StringBuilder Class Object into String

Let's see the simple code to convert StringBuilder object to String in Java.

ObjectToStringExample2.java

Output:

String is: hello
Reverse String is: olleh

Now we can write the code to check the palindrome string.

ObjectToStringExample3.java

Output:

Palindrome String

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Java Conversion

Java Misc

Java Convert an Object to String

Using toString() Method

Java Program to Convert Object of Predefined Class(StringBuilder) to String

Using Sting.valueOf() Method

Using + Operator

Using String.join() Method

Java Program to Convert User-defined Class Object into String

Java Program to Convert Pre-Defined StringBuilder Class Object into String

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